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Description

A security flaw has been discovered in GPAC up to 2.4.0. Affected is the function MergeFragment of the file src/isomedia/isom_intern.c of the component MP4Box. The manipulation results in null pointer dereference. The attack needs to be approached locally. The exploit has been released to the public and may be used for attacks. The patch is identified as 525bf1af642c30af04e4df5345e6d798c0a4d8a1. It is advisable to implement a patch to correct this issue.

PUBLISHED Reserved 2026-05-26 | Published 2026-05-26 | Updated 2026-05-26 | Assigner VulDB




MEDIUM: 4.8CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
LOW: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
LOW: 3.3CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
1.7AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C

Problem types

NULL Pointer Dereference

Denial of Service

Timeline

2026-05-26:Advisory disclosed
2026-05-26:VulDB entry created
2026-05-26:VulDB entry last update

Credits

fczhang (VulDB User) reporter

References

vuldb.com/vuln/365629 (VDB-365629 | GPAC MP4Box isom_intern.c MergeFragment null pointer dereference) vdb-entry technical-description

vuldb.com/vuln/365629/cti (VDB-365629 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/816075 (Submit #816075 | GPAC MP4Box <= 2.4.0 (master commit 7508ccc and earlier) Null pointer dereference (Denial of Service)) third-party-advisory

github.com/gpac/gpac/issues/3549 issue-tracking

github.com/user-attachments/files/27196918/poc.zip exploit

github.com/...ommit/525bf1af642c30af04e4df5345e6d798c0a4d8a1 patch

github.com/gpac/gpac/ product

cve.org (CVE-2026-9567)

nvd.nist.gov (CVE-2026-9567)

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